如何佈署Python Web 服務 - How to deploy Flask web app with WSGI + Nginx

需要

• Gunicorn
• Nginx

Step 1. 部屬Flask app程式碼

複製程式碼到指定位置

e.g

/var/www/flaskapp

$ sudo mkdir /var/www/flaskapp

$ sudo chmod 777 /var/www/flaskapp

Step 2. 安裝WSGI Server (Gunicorn) 

安裝

sudo apt-get install gunicorn

or

pip install gunicorn

Step 3. 安裝web server (Nginx)

sudo apt-get install nginx

設定

sudo vim /etc/nginx/site-avalidable/default

將內容改成如下

server {

    listen 80;

    server_name 10.36.172.142; # external domain name

    location / {

        proxy_pass http://0.0.0.0:5678; # point to gunicorn host address

        proxy_set_header Host $host;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    }

  }

啟動

sudo service nginx restart

Step 4. 啟動Gunicorn

gunicorn -w 4 -b 0.0.0.0:5678 {主程式檔名}:{flask實體名稱}

假設我們主程式叫做main.py內容如下

from flask import Flask

app = Flask(__name__)

if __name__ == '__main__':

    app.run()

gunicorn -w 4 -b 0.0.0.0:5678 main:app

以上指令就是說

開一個worker = 4的service起來

而且去聽0.0.0.0:5678

收到請求時做調用main.app

Step 5. 檢查服務是否有成功跑起來

ps aux | grep ngix